1. Department of Chemistry and Center for
Advanced Nanoscale Materials, University of Puerto Rico, Río Piedras Campus, P.O. Box 23346, San Juan, Puerto Rico 00931-3346, United States
2. Physics and Astronomy Department, University of Texas at San Antonio, San Antonio, Texas 78249, United States
3. Departamento
de Ingeniería Química, Universidad de Sonora, 83000 Hermosillo, Sonora, México
4. Department of Chemical Engineering, University of Massachusetts, Amherst, Massachusetts 01003, United States